package com.zeng.utils;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import java.io.IOException;
import java.io.InputStream;

/**
 * @author zeng
 * @data 2021/07/02 16:06
 */
public class MybatisUtils {
    private static SqlSessionFactory sqlSessionFactory;
    static {
        //获取Mybatis第一步：获取sqlSessionFactory对象
        String resource = "mybatis-config.xml";
        //InputStream inputStream = null;
        try {
            InputStream inputStream = Resources.getResourceAsStream(resource);
            sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    /*有了sqlSessionFactoru，就可以获得SqlSession的实例
     * SqlSession完全包含了面向数据库执行SQL命令所需的所有方法
     **/
    /**
     * @return sqlSession
     */
    public static SqlSession getSqlSession() {
        return sqlSessionFactory.openSession();
    }
}
